Microbiologically-influenced corrosion of the electroless-deposited NiP-TiNi – Coating
Eman M. Fayyad, P. Abdul Rasheed, Noora Al‐Qahtani, Aboubakr M. Abdullah, Fatma Hamdy, M. A. Sharaf, Mohammad K. Hassan, Khaled A. Mahmoud, A.M.A. Mohamed, George Jarjoura, Zoheir Farhat
Abstract
In this study, we reveal the microbiologically influenced corrosion (MIC) behavior of the new electroless NiP-TiNi nanocomposite coating in simulated seawater using the electrochemical impedance spectroscopy (EIS) technique after different periods of incubation time (7, 10, 14, 21, 28 days) in a sulfate-reducing bacteria (SRB) medium. The biofilm formation and the corrosion products were characterized using the scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The EIS results revealed the carbon steel (CS)/NiP-TiNi and NiP-TiNi/SRB biofilm interfaces' characteristics after different incubation times in the SRB media. EIS measurements revealed that the NiP-TiNi nanocomposite coating's MIC resistances are superior relative to API X80 carbon steel and a TiNi-free NiP coating, with ∼93% of corrosion inhibition efficiency after 28 days of incubation.